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The three-axis bipolar motion control driver can provide up to 9 amps
of power at 12 volts. Output current to each stepper motor is adjustable
up to 2A. A power supply and a cooling fan are integral with the
internal circuitry. The box measures 11.5" x 8.5" x 5" has
four rubber feet, a lighted on/off switch and weighs 10 pounds. It
plugs into your PC's printer port with a 25 pin DB25 M/F cable. Round 6-pin
DIN type connectors terminating the stepper motor cables plug into X, Y,
and Z labeled sockets on the box's front panel.
Bipolar drivers are more powerful than unipolar drivers because more
of the stepper motor windings are engaged at any one time. Bipolar
circuit designs change the polarity of the stepper winding with each step.
You also get a 50% increase in speed with this driver over the unipolar
driver. You can expect a reliable (no motor slipping) top speed of
around 10 in/min (200 rpm) vs around 6 in/min (120 rpm) for the unipolar
driver. While the torque at low speeds is comparable, the bipolar
driver maintains it better as the speed increases.
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